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    hey people, can you help tell me how do you draw these strucutres??
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    I can't really draw these on here very easily so I'll link to the correct structures.

    Cl2O7: The chlorines are joined by an oxygen in between and then are double bonded to 3 oxygens each in addition: http://www.chemdrug.com/databases/dataimg/13/123272.png

    Al2O3: This is ionic with a rather complex crystal structure. To be honest I'm not sure how they'd want you to represent this in your exam so I don't really want to suggest anything. But the structure is here: http://som.web.cmu.edu/structures/S058-Al2O3_web.jpg

    SiO2: This has a very similar giant covalent structure to diamond. Every Si atom is tetrahedral and bonded to 4 oxygens, and each oxygen bonded to 2 silicons. Someone has built a nice model of this: http://www.seewellcn.com/images/prod...M-005-SiO2.jpg
 
 
 
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